Water-proof and fire-proof material for roofing



(Specimens.)

A. BLANK. WATER PROOF ANO FIRR PROOF MATERIAL POR ROORING.

NO. 409,096. Patented Aug, 13, 1889.

UNITED STATES PATENT OFFICE.

ALOIS BLANK, OF ST. LOUIS, MISSOURI.

WATER-PROOF AND FIRE-PROOF MATERIAL FOR RO'OFING.

SPECIFICATION forming part of Letters Patent No. 409,096, dated August13, 1889.

Application led January 23, 1889. Serial No. 297,281. (Specimens.)

city of St. Louis, 'in the State of Missouri,

have invented a certain new and useful Improvementin Tater-Proof an dFire-Proof Material for Roofing and other Purposes, of which thefollowing' is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification.

The object of my invention is to produce a flexible water-proof andpractically fire-proof material for roofing, siding, and analogouspurposes, the material being composed of asbestus with anintimately-united coating of metal.

Figure I is a view of a sheet exhibiting the various stages ofpreparation. Fig. II is an enlarged section at Il II, Fig. I.

l is asbestus paper or board of any desired thickness. The asbestusmaterial is iirst treated with a mixture of powdered plumbago or othernon-volatile carbonaceous Inatter and volatile liquid. rlhe asbestus maybe treat-ed upon one or both sides. The volatile part of the mixture isthen evaporated by next deposited by electricity upon the asbestus, thecopper taking hold of the grains of plu Inbago, which rest in theinterstices of the asbestus, and so becoming closely united with thelatter. The material is then immersed in a bath of melted metal,preferably tin, lead, or zinc, or an alloy of any two or more of them.The molten metal is deposited on the copper, and thus a sheet 4 of themolten metal is attached to the asbestus fabric. The material is veryiieXible, and is practically a nonconductor of heat and lire-proof.

The preferred manner of preparing the article has been herein described;but I do not confine myself strictly thereto. The process has beendescribed Inore at length in my application filed on the 23d of October,1888, Serial No. 288,886, where claim is made for the process ofmanufacture.

It will be understood that no vegetable' fiber admits of the describedtreatment, because the heat of the molten Inetal would destroy it.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The metallized asbestus material composed of a body l of asbestus havingits interstices supplied with carbonaceous material, a coat 8 of copperadhering to the ca rbonaceous material and entering the interstices ofthe asbestus, and an outer sheet or layer/4 of metal overlying thecopper 8, substantially as set forth.

ALOIS BLANK. Vi tn esses: SAML. KNIGHT, BENIN. A. KNIGHT.

